Tenugui has been a very familiar and useful item for the Japanese since the EDO period (1603~) as a thin Japanese towel made of cotton or you could call it a Japanese traditional towel. In the days of old, it was used for wiping or as a handkerchief. It was also used as a dishcloth, headband, souvenir, and a tapestry for decorating rooms.
It's water absorbable qualities are far more superior than standard hand towels and it also dries faster.
Another interesting thing is that these towels are 35*90cm in size, so you can fold them thinly enough to fit almost anywhere.